Well-pipe screen



July 3, 1 923. 1,460,735

5. ST.J 0HN WELL PIPE SCREEN Filed Dec. 21. 1921 Patented Jul 3, 1923.

UNITED STATES SPENCER H. J'OH N', OF LONG BEACH, CALIFORNIA.

WELL-PIPE scnann.

" Application fllednecember 21, 1921. Serial No. 524,004.

To all whom it may concern:

Be it known that I, SPENCER JOHN, a citizen of the United States, residing at Long Beach in the county of Los Angeles and State of California, have invented certain new and useful Improvements in, Well- Pipe Screens' and I do hereby declare the following to 'e a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains'to makeand use the same.

This invention relates in the main to oil wells, and the object of the invention is to provide the tubular casing of such wells with screens adapted to exclude sand and other foreign matter, and admit the liquid product.

The invention comprises certain improvements in such screens and in the method of attaching the same to the well-pipe, as Wlll be hereinafter fully set forth and claimed.

In the accompanying drawing, forming a part of this specification, Fig. 1 is a front elevation of my improved screen as applied to a pipe. Fig. 2 1s a central, vertical section of the same. Fig. 3 is a central, transverse section of the same. Fig. 4 is a front elevation of a modified form of screen. Fig, 5 is a central, vertical section of the same. Fig. 6 is a central, transverse section of the same. Fig. 7 is a cross section lengthwise of-the screen blank as used in Fig. 1, before bending to final form. Fig. 8 is a cross section of the blank screen as used in Fig. 4, before the final bend. Fig. 9 illustrates the type of milling cutter used in forming the screen seat in Fig. 1, and Fig, 10 illustrates the milling of the seat in Fig. 4.

In the drawing, he numeral 5 denotes a fragment of well-casing such as is used for deep wells. At one or more points in the,

side of this pipe it is necessary to make openings to admit oil, or the like, the end being supposed to be closed. These openings must be efi'ectually protected by suitable screens, or foreign matter will enter and artially or-completely clog the well. This has already been done in many ways, but never, to m knowledge, b the use of a perforated single plate fitte toan undercut seat in the. pipe.

In preparing the seat forthe screen a hole 6 is first bored throu h the pipe. A concave seat is then milled jacent to the hole, the

milling being such as to produce an undercut to retaln the screen-plate 8 or 8, at the sides. The seat shown in Figs. 1, 2 and 3 is best formed by a milling cutter of the type shown in Fig. 9, by first feeding down, and then sidewise, thus formin a T-groove'or seat, with retaining side-ri 9. Into this seat is slipped the screen-plate 8, first punched with narrow slots 8", and then bent to the proper curvature, A little inbending of the ends of the ribs at 9 locks thescreen securely in position.

The type of screen shown in Figs. 4, 5 and 6 involves the same principle of construction, but differs somewhat in form. By the use of a milling-cutter such as illustrated in Fig. 10 the concave seat is formed with dovetailed sides, and curved as indi cated. 'It is evident that a screen-plate once inserted in such a seat cannot come out or move endwise, if set snugly in place. This may be done by blanking out the screenplate from stock curved as shown in Fig. 8, setting it in place, and then flattening out the original curvature, thus spreading the plate into the dovetailed seat, and preferably curving it to fit the concave thereof, as shown in Fig. 5, though it would not be impossible to leave the plate perfectly flat, with fairly 0d results.

In the figures illustrating the modified form of screen and attachment the slots have been shown running lengthwise of the plate slots on the inner side. This is .a very important feature, since it gives inside clear- Y ance, and any matter, whether oil, or substances that would tend to clog the screen, are easily sucked up by the action of the pufiip, or the flow of the liquid, if a flowing we The invention admits of the use of screen plates which may be very rapidly punched from fairly thick malleable stock (preferably sheet brass), and may be quickly and pering. soldering, or'other slow operations.

Having thus described my invention, I

claim:

I 1. A screen for well-tubing provided with narrow slots, and bent transversely of the 106 manently secured in place without threadsiets for seating in the tubing, the screen in snifi seats, being first bent end narrowed being flattened as inserted whereby the slots for insertion, and finally flattened to spread ere spreedi en the inner sidle. and fit snugly in the seats, A 2. Combined with Well-tubing having cen In testimony whereof I efiix my signaenve, laterally undercut seats, outwardly ture in presence of twe Witnems; V eeneeve screen-pistes fitting in said seats and held in place nt the undercut sidies. SPENCER JOHN 3. (Cembineei with welt-tubing having let- Witnesses: erniiy undercut seats termed therein, per- Tees. W. Wmmme,

M) foneted-sereen-pietes edepted for attachment D. A. Msmmwe; 

